Just as a healthy skin barrier is essential for your face, a healthy scalp barrier is crucial for your hair - and it all starts with a scalp serum. Nourish your scalp and promote thicker, healthier hair with this lightweight skincare-inspired scalp serum. Formulated with microbiome-balancing Probiotics to combat flakiness or an oily scalp, hair-strengthening Red Clover Extract for added volume, and follicle-repairing Centella Asiatica to revitalize lifeless locks, FAQ™ Scalp Recovery & Thick Hair Probiotic Serum makes for the perfect leave-in treatment for thinning, lifeless locks.